JPS5914235A - Multipolar type circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a multi-pole type circuit breaker, and particularly to a multi-pole type low-voltage circuit breaker having a neutral pole, with the aim of improving the early-on/late-off function of the neutral pole. Yes Generally, dipole type circuit breakers and earth leakage circuit breakers are mainly used as multi-pole type low voltage circuit breakers with a neutral pole, and such circuit breakers have a switching function for the neutral wire. Three poles are commonly used to open and close the poles and the voltage line side.

In such a multi-pole circuit breaker, the neutral pole is provided with early, on, and late off functions, so that stable performance as a breaker can be obtained during opening/closing and breaking. However, among these, the slow cut function at the time of contact opening does not have a significant effect on the arc extinguishing operation, so the opening of the contact at the neutral pole is performed by the contact at the three poles on the voltage line side. It is necessary to obtain a sufficient time difference in delaying the opening of the circuit.

However, in conventional multi-pole circuit breakers of this type, the structure of the contact at the neutral pole is almost the same as the contact at the other 3 poles on the voltage line side, but the structure is similar to that of the contact at the neutral pole, and the structure is similar to that of the contact at the other three poles on the voltage line side. Since the circuit is configured to have a function, there is a problem in that the required time difference cannot be obtained between the opening at the neutral pole and the opening at the other pole. In other words, in the case of a closing operation, there is no problem as long as the closing of the neutral pole contact precedes the closing of the 3-pole contact on the voltage line side, but in the case of an open circuit, the neutral pole contact Because the time difference as a delay in the opening operation for the three-pole contact on the voltage line side is too short, even though each pole contact on the voltage line side is mechanically opened, the terminals are then connected by an arc. In this condition, the neutral contact opens. Therefore, if there is an imbalance in the load between the three poles on the voltage line side, a high voltage will instantaneously occur between one of the poles and the neutral pole, causing damage to the equipment on the load side. There was a risk of giving away.

The object of the present invention has been made in view of these problems, and the purpose of the present invention is to maintain a sufficient time difference in the early-on/late-cut function of the neutral pole contact with respect to the other pole, especially in the late-cut function. The object of the present invention is to provide a multi-pole circuit breaker which can prevent this type of accident by its appropriate slow-off operation.

That is, the present invention provides a multi-pole circuit breaker in which a neutral pole that opens and closes a neutral line and a pole that opens and closes a voltage line each have a fixed contact and a movable contact that rotates in conjunction with a holder. In the device, the fixed contact and the movable contact of the neutral pole have a blade-type contact structure.

The present invention will be described in detail below with reference to the drawings. Figure 1 shows one of the poles used on the voltage line side of the multi-pole circuit breaker of the present invention. In the case of a type circuit breaker, the poles in this configuration are three poles and an external neutral pole used to open and close the neutral line, and these l
The poles are arranged in a direction perpendicular to the plane of the drawing, separated from each other by partition walls, and assembled into one piece. Here, l and λ are a case and its cover made of an insulating material, respectively, and 3 is a fixed terminal conductor and a fixed contact of the gouge attached to the case l. j is a movable contact whose movable contact t is pressed toward the fixed contact l in the closed circuit state as shown in the figure, and the movable contact S is connected to the heater through the flexible conductor 7 and the intermediate connecting piece. The heater and the load side connection terminal 10 are connected by the flexible conductor /l.

/2 is a holder that is rotatable around the rotation axis 13, and the holder 12 and the movable contact j are connected by a pin /4f. /3 is a contact spring hooked between the holder /2 and the movable contact j, and the spring force of this spring 15 presses the contact 6 of the contact j to the contact q.

In addition, the holder 12 has an opening/closing interlocking angle shaft made of an insulating material.
6 is provided, and when the holder 12 rotates around the rotation shaft 13 supported by the frame/7 during opening/closing and shutoff, it is pivoted to this square shaft/6 by operating as the holder 12 rotates. By rotating the holders (not shown) of the other poles in unison, the respective poles can be opened and closed. Furthermore, as the main opening/closing mechanism, toggle links 2/ and n are connected via a toggle link shaft between the trip lever/9 attached to the frame/7 via a rotation shaft/g and the holder/2. At the same time, the lower end of the opening/closing lever n having the manual opening/closing knob 2JA is swingably supported on the pivot 17A of the frame/7, and an operating spring 21 is provided between the opening/closing lever 23 and the toggle link shaft. Let it hang.

The tripping lever /9 is used together with the 7th lever B to perform an overcurrent tripping operation, and in the closed circuit state, its locking claw /? A
is maintained in a locked state by the 7 hook 25, and when the trip shaft 26 is rotated to be described later, the 7 hook B is rotated to release the engagement pawl 19 from the 7 hook λS. Rotate the lever/9 counterclockwise around the shaft. 27 is a bimetal provided in the overcurrent device section I. When the heater 9 is heated by the overcurrent, it bends due to the heat generated, and its head pushes the trip shaft 26 to rotate it, causing the 7tsuk B The tripping lever 19 is caused to perform a circuit-opening operation via. Furthermore, 29 is an electromagnetic device that performs instantaneous operation.

Next, the neutral pole will be explained. FIG. 2 shows the opening/closing mechanism at the neutral pole, where 103 is a fixed terminal conductor of the neutral pole, and 10tI is its fixed contact. 1 more
0j is a movable contact, which is shown in an open state in this figure, so the movable contact 10j is separated from the fixed contact 1011. Here, the fixed contact 10Il and the movable contact 10j have a blade-type contact structure. That is, the fixed contact IO'l is formed into two halves as shown in FIG. 3, and has an elastic part 10IIA, and in such a closed circuit state, the blade-shaped movable contact is caused by the spring force of this elastic part 10414A. The child 103 K is held by applying a contact pressure P in the direction of the arrow. In addition, in such a blade-type contact structure, when the pole is in a closed state, the fixed contact 1 of this neutral pole
As shown in the figure, the electromagnetic action caused by the energizing currents branching to 011 in the same direction generates an attractive force between the fixed contact 10tI and the movable contact 10, so that the contact pressure is further increased.

Furthermore, here, the movable contact lOj is as shown in FIG.
It is connected to the neutral electrode holder //, 2 by the bottle //,
A holder is attached to the spring hook 103 of the movable contact 10j.
The movable contact ios is biased in the clockwise direction by the spring force of the spring l/j hooked between the hooking part // of 2 and 2A, and it comes into contact with the stopper //JB of the holder //λ. I'm letting you do it. In addition, /l C is a stop piece provided on the holder //, 2, and the movable contact 10S resists the spring force of the spring //3 and rotates around the bottle // at an angle of 00 in the counterclockwise direction. If it rotates, it will come into contact with this stop piece //2c.

That is, a state 101 shown by a dashed line in a closed circuit state
The movable contact 103 that maintains the /7
．． When the holder 12 of the other pole begins to be rotated around the rotation axis 13 by the interlocking angle shaft/b, it still remains held by the contact pressure of the fixed contact 1oII. As the rotation of the holder //λ progresses, the clamped movable contact 10j is rotated counterclockwise around the bin //410, and when the holder //λ has been rotated by an angle of 00, the holder //2
It comes into contact with the stop piece //. Therefore, the movable contact /(H is forcibly rotated together with the holder 17.2, and since the circuit is opened at the neutral pole for the first time, the movable contact 103 rotates at this angle θ. The opening operation at the neutral pole is delayed compared to the opening operation of the movable contact j at the other poles only while the movable contact j (When H separates from the fixed contact 10II, the restraining force held by the fixed contact 1011 due to its spring properties disappears, so the movable contact 101 is moved from the pin //lI by the spring force of the spring //j.
is rotated clockwise around the stopper l/
In contact with λB, the movable contact 103 is in the final state of open circuit.
A required separation distance can be maintained between the fixed contact 1011 and the fixed contact 1011. Note that 100 is a neutral terminal conductor connected to the movable contact ios by the flexible conductor 7.

The configurations of the voltage line side pole and the neutral pole have been described above, but next we will discuss the voltage line side pole movable contact j and the neutral pole movable contact 101 in the multipolar circuit breaker of the present invention. The relative positions of and the connection mechanism thereof will be explained with reference to FIG.

Figure q shows the open circuit state, and when the separation distance of the movable contact B on the voltage line side with respect to the fixed contact A is DL, and the separation distance of the neutral pole is D9, DL>D. Arrange and configure each.

That is, with this configuration, when closing a circuit, the movable contact 103 of the neutral pole always comes into contact with the fixed contact 1011 before the movable contact j of the pole on the other voltage line side, and The energization in the polarity can be made to occur in advance of the energization in the other polarity. However, even at the neutral pole, it is necessary to ensure a required distance i for the separation distance DH, and it is not possible to make a large difference between the separation distances DL and DH. If so, the early entry function of the neutral electrode during circuit closing operation can be fully utilized.

FIG. 5 shows another embodiment of the invention. In this example, the neutral electrode can be opened manually only when necessary. Normally, the neutral electrode is kept in a conductive state at all times, giving it a slow cut function. effect can be obtained.

That is, here, /30 is an insulating lever that is rotatable around the shaft /3/ as a fulcrum, and is operated by the spring force of the return spring /32 hooked between it and the case /. When in use, maintain the posture shown by the solid line. Furthermore, in this example, the holder //2 has a destination plate / as shown in Fig. 2.
7.2G is not provided. Therefore, when it is necessary to open the neutral pole as well, by operating the handle part /30A protruding from the cover 2 of the insulating lever /30 to the position shown by a single point @ line, the heel part /30B can be moved. The contactor 103 is pushed up to release the restraint by the fixed contactor 10II, and can be pulled up to a position where the separation distance is maintained by the spring force of the spring //N. Note that the other configurations and the early entry function when closing the circuit are different from the example described above, and as explained above, according to the present invention, the neutral pole and the voltage line side pole are interlocked via the opening/closing interlocking shaft. By setting the opening distance between the fixed contact of each operating movable contact or the stationary contact at the time of opening for the neutral pole to be shorter than the other poles, an early entry function is achieved at the neutral pole when the circuit is closed. is maintained, and only the movable contact and the fixed contact at the neutral pole have a blade-type contact structure, and in the closed circuit state, the force-type movable contact is held by the contact pressure obtained from the fixed contact. Since it is configured so that it is restrained by contact pressure unless a predetermined release force is applied, it is possible to reliably perform slow cutting at the neutral pole for the time period during which the predetermined release force is not applied even when the circuit is opened. Such a slow cut-off function can prevent accidents that could damage equipment on the load side.

In addition, in the above example, a self-blade contact structure was used in which an elastic part was provided on the fixed contact and the spring force of this elastic part was used.
It goes without saying that a spring may be provided separately from the fixed contact having a structure such as the above, and a force-dependent contact structure may be used in which the movable contact is held between the fixed contact and the fixed contact by the spring force of the spring.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of the configuration of the voltage line side poles in the multi-pole circuit breaker of the present invention, Fig. 2 is a diagram showing an example of the configuration of the neutral pole, and Fig. 3 is a diagram showing an example of the configuration of the neutral pole. FIG. 1 is a front view of the closed circuit state of the fixed contact and the movable contact of the polarity as seen from the line A-A, and FIG. FIG. 5 is a diagram showing an example of the configuration of a neutral pole in another embodiment of the present invention. l...Case, λ...Cover, 3...
・Fixed terminal conductor, G...Fixed contact, j...Movable contact, ≦...Movable contact, 7...Flexible conductor,
t...Intermediate connection piece, Ri...Heater,
/θ...connection terminal, l/...flexible conductor,
/2...Holder, 13...Rotation axis, /l.
...Bin, 15...Spring, /4...Interlocking angle shaft, /7...Frame, /7A...
Pivot part, /I...Rotation axis, /9...Trip lever, /9A...Latching claw, I...Toggle link shaft, 2/, #...Toggle link, n
...Opening/closing lever 1? jA...knob,
2g...operation spring, B...hook, U
... Trip shaft, 1... Bimetal,
d... Overcurrent identification device, 29... Electromagnet device,
100...Terminal conductor, lO3...Fixed terminal conductor, 1ott...Fixed contact, 1oth...Elastic part, ios...Movable contact, 103k...Latching part, 10r/...・Condition, //2... Holder, / /2k... Hanging part, //, 2B... Stopper, //20... Dead end piece, //'l... Bin, llj ...Spring, 130...Absolute RI
/ /(-, 13oh-handle part, /JOB... heel part, 13/... shaft, /32... return spring. Patent applicant: Fuji Electric Manufacturing Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] 1) A multi-pole type having a fixed contact and a movable contact that rotates in conjunction with a holder on the neutral pole that opens and closes the neutral line and the pole that opens and closes the voltage line, respectively. In a circuit breaker,
A multi-pole circuit breaker, characterized in that the fixed contact and the movable contact of the neutral pole have a blade-type contact structure. 2. In the multi-polar circuit breaker according to claim 1, in the blade-shaped contact structure, the return force in the opening direction of the movable contact of the neutral pole is generated from the fixed contact of the neutral pole. A multi-polar circuit breaker characterized by being restrained by the contact pressure of. 5) % Allowance In the multi-polar circuit breaker according to claim 2, the return force in the opening direction of the movable contact, which is restrained by the contact pressure from the fixed contact, is increased by a predetermined angle of the holder. A multi-pole circuit breaker characterized by being released when rotated. 4) In the multi-polar circuit breaker according to claim 2, the return force in the opening direction of the movable contact, which is restrained by the contact pressure from the fixed contact, is applied to the opening/closing force on the voltage line side. A multi-pole circuit breaker characterized by being provided with means for releasing the circuit after the poles are opened.